|
FOUR CHARACTERISTICS of MAGNIFIERS:
| 1. Power of Magnification |
| The ability of the lens to increase the
visual size of an object. The symbol X (times) is used
to identify |
| this factor. For example, a 3X magnifier
triples the size of an image. |
| • Light rays are bent by the curved
lens surface resulting in an image that looks larger than
the actual |
| object. |
|
| 2. Working Distance
(Focal Length) |
| In addition to power, a magnifier will also
be classified for working distance. For example, 2X at
a |
| working distance of 5" (127 mm) from
the object. |
| • The amount of space between the
object and the magnifier; the shorter the working distance,
the |
| higher the power. |
|
| 3. Field of View |
| The size of the area that is seen through
the magnifier; the field of view decreases as the power
|
| increases. |
|
| 4. Depth of Field |
| The distance that a magnifier can be moved
from an object and still have the object in focus; the
higher |
| the power, the shorter the depth of field. |
| |
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